Weekend exclusion configurable

A 2-day follow-up configured Friday lands Sunday when exclude_weekends is missing, so the prospect sees your nurture step buried under Monday morning inbox triage instead of arriving mid-Tuesday when it was meant to reinforce the initial touch. Campaigns that add calendar days instead of business days collapse sequence cadence across weekends, breaking the carefully-spaced rhythm sales and lifecycle teams designed and reducing the user experience quality of the automation tool itself.

Replace date.setDate(date.getDate() + delayDays) with a business-day-aware delay function in the step scheduler. Store the exclude_weekends flag on the sequence record and branch on it when computing each step's send time. File: src/lib/scheduler/delay.ts.

function addBusinessDays(start: Date, days: number): Date {
  let result = new Date(start), added = 0
  while (added < days) {
    result.setDate(result.getDate() + 1)
    const dow = result.getDay()
    if (dow !== 0 && dow !== 6) added++
  }
  return result
}